Intel Corporation

Apple Inc.

Oren E Avraham

Harald Pretl

Werner Schelmbauer

Ram S Kanumalli

Josef Holzleitner

Avi Sulimarski

Silvester Sadjina

A method and apparatus for cancelling an interference in a received signal. The apparatus may include a plurality of receivers and one or more transmitters. The first receiver is configured to process a received signal. The first receiver includes a mixer to down-convert the received signal using a first local oscillator signal having a first frequency. The received signal includes a wanted signal and an unwanted signal. The second receiver is configured to process the received signal and generate an interference reference signal. The second receiver includes a mixer to down-convert the received signal using a second local oscillator signal having a second frequency. The apparatus includes an interference canceller configured to cancel, in a digital domain, at least in part interference caused by non-linear characteristics of the first receive chain in a presence of the unwanted signal from the down-converted received signal by the first receive chain.

Method and apparatus for cancelling interference in a transceiver

A transmitter includes a pre-emphasis digital filter configured to filter a series of respective digital input data samples according to a plurality of coefficients to generate a series of respective corresponding pre-emphasized data samples. The transmitter also includes a digital-to-analog converter (DAC) configured to sample the series of pre-emphasized data samples to generate an analog signal and an analog filter configured to filter the analog signal to generate a filtered signal. Estimator circuitry is configured to input a pre-emphasized data sample; input a corresponding sample of the filtered signal; and calculate the plurality of coefficients based on the sample of the filtered signal and the pre-emphasized data sample.

Digital pre-emphasis quadrature imbalance compensating filter

Described herein are architectures, platforms and methods for implementing cancellation of asymmetric quadrature gain imbalance due to frequency selective quadrature baseband coupling in a transceiver of device. Radio frequency (RF) are converted to quadrature baseband signals, estimation is made as to coupling between in-phase (I) and quadrature-phase (Q) channels of the quadrature baseband signals. The quadrature baseband signals are converted into digital baseband signals, and digital compensation is applied on the digital baseband signal based on the estimated amount of coupling.

Frequency-selective quadrature baseband coupling cancellation

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Herzlia, Israel

Oren E Avraham